M9 Pistol is the service pistol of the US ArmXSy from 1990 which design based on the M92F Semi-auto Pistol Series from Italy. It replaced the old M1911A1 pistol which used by US Army for more than 50 years. In 2003, US Army promoted the advanced model of the M9 Pistol – M9A1, which adds a Picatinny rail on the lower frame for using the fresh light or lasers, M9 still used as the main service pistol and not be replaced by other pistol in these years.